Billboards

There are three Octan billboards found around Bricksburg that can be changed into a "Question Authority" billboard by Master Builders. Finding and changing all three of them will result in the unlocking of a Red Brick.

BillBoard #1

The first billboard can be found in the residential square. Looking at Emmet's house, head over to the right. Here you will find a pink fence. Destroy it and create a surface for a female character to wall climb with (This will already be done if you found the Instruction Pageor Cat up here. The door to get up here however, needs to be re-opened every time the world is loaded). Once on the roof destroy the red bench. This will reveal a green circle on the ground. Stand on it and aim at the billboard.

Billboard #2

The next billboard can be found on top of the train station, above the restaurant near the ice cream truck. Head up the stairs to the top floor with a female Master Builder. On the right there will be netting that a female character can climb. Head over to the billboard and destroy the dumpster right in front of it. You will now have access to the green spot on the ground. Aim at the billboard.

BillBoard #3

This billboard requires Vitruvius to be unlocked. Using him, head towards the building to the left of the construction site entrance. On the sidewalk you will find a marker. Stand on it with Vitruvius to perform the secret knock. Enter the hole in the wall. When you walk out you will find yourself on the roof. Destroy the barrel and use it to create a small bridge for Vitruvius to walk across. While over here don't forget to head over to the crane and activate the lever with Circle/B. Jump down (go to the right so you won't hit the electrical wires) from this roof onto the roof below. Head over to the left and enter a half built room. Destroy the small pile of Legos to unveil a green spot. Stand on it and target the billboard beneath you (While on this floor it is also beneficial to activate the crane on this floor with a Construction character. You can then push the Legos the crane drops into the correct spot on the fountain and unlock a Red Brick).